Angina is a pain or discomfort in your chest, arm, neck, stomach or jaw that happens when the blood supply to your heart becomes restricted because of your arteries becoming narrowed. This clogging is called atheroma. Angina is a symptom of coronary heart disease, not an illness in itself. Angina is your heart’s way of telling you it’s not getting enough oxygen when you’re doing something strenuous or you’re feeling under stress. Many people learn to recognise how much activity will bring on an angina attack - this is called stable angina. If you have unexplained chest pain, seek urgent medical advice - you will need an assessment of your overall health.